Mainspring-fastener for watches.



No. 654,873. Patented luly 3|', |900.-

I D. H. CHURCH.

M AINSPRING FASTENER FR WATCHES. (pplication tiled Apr. 14, 1899.)

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rrnn W STATES .PATENT Grrr DUANE n. cannon, or Nnwroiv,MAssAoi-Iusnr'rs;

srnorrronrronformingpart er Letters Patent No'. 654,873, dated July' 31,1906.

I Applicaties led Aprill'l, 1899*. Serial No.`712,'9711. (No model.)

To alii wir/0m it may concern/r Be it known that I, DUANE Il. CHURCH, ofNewton, in the county of Middlesex and State of Massachusetts, haveinvented certain new and useful Improvements in Springs andSpring-Barrels for lVatehes and Clocks, of which the following is aspecification.

i This invention has relationto springs and as a tongue-and-grooveconnection, -for pre- 1 venting the spring from leaving the barrel orfrom working against the going-wheel, all as illustrated upon thedrawings, described in the following specification, and pointed ont inthe claims hereunto appended.

Reference is to be had to the accompanying drawings, and to the lettersmarked thereon, forming a part of this specification, the same lettersdesignating the same parts or features, as the case may be, whereverthey occur.

Of the drawings, Figure l represents a magnied section through a spring,barrel, and arbor embodying my invention. Fig. 2 represents a horizontalsection on the line 2 2 of Fig. l. the spring-barrel after the arbor andspring have been removed. Fig. et shows the devices tor connecting themainspring with the supplemental or drag spring.

On the drawings the arbor a', which is journaled in the watch-plate b,has a squared portion to t into a square aperture c in the barrel c. Thewindingwheel d is rigidly secured upon the projecting end of the arborby a screw e, while the going-wheel f, which covers the barrel andprojects therebeyond has an externallynthreaded hub f', on which isscrewed a nut f2. The mainspring g has an aperture at its inner end toreceive a hook f3 on the nnt and at its outer end an outwardly andrearwardly projecting tongue or lip g. The supplemental or drag springhis beveled at one end, as at h', to slip under the tongue or lip g',and its other end rests against the Fig. 3 represents a section through'inner side of the end of the 1nainspring, so that the two springs arerigidly and detach-y ably connected together and the mainspring isfrictionally connected with the barrel. The peripheral wall of thebarrel has an internal groove c2, and the drag-spring is provided with aplurality of tongues or projections 7b2, formed by indenting its innerface, which project into thel groove c2, as shown in Fig. 2, the end ofthe tongue g likewise extending into said groove. Consequently thefrictional engagement of the drag-spring with the barrel is notdisturbed, although both springs are held against axial movement and arepre# vented from rubbing against the going-wheel f. The number ofprojections 7a2 may be varied as occasion demands. 1

It will be readily understood that although the lip g and theprojections h2 extend into the groove c' there is no liability of theseparts contacting with the wall of the barrel in case the mainspringshould break. As shown, there is only the frictional contact between thedrag-spring and the wall, and therefore when the spring breaks thedragspring will be carried around with the broken end of the mainspringwithout detriment to the works of the watch, while all tendency of thebreaking of the mainspring when being wound is entirely overcome, as isusual in this class of watches. It will also be readily understood thatby reason of the 'fact that the peripheral groove c2 is formed with noobstructions, being continuous, there is a continuous u nobstructedpassage-way formed for the lip g and projections h2, which extend intosaid groove, allowing the mainspring and drag-spring to have' a freefrictional movement relative to the barrel, axial movement beingprevented, as liereinbefore set forth.

Having thus explained the nature of the invention and described a way ofconstructing and using the same, although without attempting to setforth all of the forms in which it may be made or all the modes of itsuse, I declare that what I claim is- 1. The combination of a spring anda barrel, of which elements one is formed with a continuous groove andthe other is formed with a projection to slide in said groove, thespring and barrel. having a free and unob- TOO structed frictionalmovement relative to each other, whereby said spring and barrel are heldagainst axial movement relatively each to the other.

2. The combination of a spring and barrel said spring having a tensiondevice, of which elements one is formed with a continuous groove and theother is formed with a projection to slide in said groove, the springand barrel having a free and unobstructed frictional movement relativeto each other, whereby said spring and barrel are held against relativeaxial movement.

3. The combination of a mainspring, abarrel and a supplemental or dragspring for frictionally connecting the mainspring with the barrel, saidbarrel having a continuous internal groove, and said main and dragspringshaving one or more projections extending into said groove,whereby said springs and barrel will loeA permitted to have a free andunobstructed frictional movement relatively to each other and will beprevented from having a relative axial movement.

4. The combination of a mainspring, a barrel, a supplemental or dragspring for frictionally connecting the mainspring with the barrel, andmeans formed on each of said elements and cooperating with each otherfor preventing the springs from having an axial movement relative to thebarrel, said means permitting the springs and barrel to have a free andunobstructed frictional movement relatively each to the other.

5. The combination of a barrel, a mainspring, and a supplemental or dragspring extending oppositely to the mainspring and interposed between themainspring and the barrel to frictionally connect them, but permittingmovement in either direction, said mainspring having at its end arearwardlyprojecting tongue or lip, said drag-spring having its endremovably engaged with said tongue or lip, said tongue or lip alsoserving to Vretain the spring from vertical movement relatively to thebarrel.

G. The combinationotaninternallygrooved barrel; a mainspring, having itsouter end provided with a rearwardly-extending tongue or lip; adrag-spring removably secured between the mainspring and said tongueorlip, said drag-spring extending opposite to the mainspring andinterposed between it and the barrel, to frictionally connect them; andontwardly-extending projections formed on said drag-spring, saidprojectionsl and said tongue or lip extending into said groove, beingadapted to prevent axial movement of said main and drag springsrelatively to said barrel, without preventing movement of said springsin either direction horizontally.

ln testimony whereof l have affixed my sig nature in presence of twowitnesses.

DUANE Il. CHURCH.

lVitnesses:

M. B. MAY, P. W. Pnzznrri.

